Abstract
Reactive multilayer foils have the potential to be used as local high intensity heat sources for a variety of applications. Most of the past research effort concerning these materials have focused on understanding the structure-property relationships of the foils that govern the energy released during a reaction. To improve the ability of researchers to more rapidly develop technologies based on reactive multilayer foils, a deeper and more predictive understanding of the relationship between the heat released from the foil and microstructural evolution in the neighboring materials is needed. This work describes the development of a numerical model for the purpose of predicting heat affected zone size in substrate materials. The model is experimentally validated using a commercially available Ni-Al multilayer foils and alloys from the Sn-Bi binary system. To accomplish this, phenomenological models for predicting the variation of physical properties (i.e., thermal conductivity, density, and heat capacity) with temperature and composition in the Sn-Bi system were utilized using literature data.
Highlights
Reactive multilayer foils (RMF) have garnered significant attention because of their potential use as localized high intensity heat sources.1–7 These materials utilize alternating submicron layers of reacting elements to generate heat
Little is understood regarding the effect of RMFs on neighboring materials and the relationship between heat transport in the bulk material and its consequential effect on the microstructure evolution of the ensemble
Due to the rapid heating and cooling conditions created by the RMF reaction, the HAZ was said to extend to the maximum distance, where Tliquidus was achieved in the substrate
Summary
Reactive multilayer foils (RMF) have garnered significant attention because of their potential use as localized high intensity heat sources. These materials utilize alternating submicron layers of reacting elements to generate heat. Reactive multilayer foils (RMF) have garnered significant attention because of their potential use as localized high intensity heat sources.. Reactive multilayer foils (RMF) have garnered significant attention because of their potential use as localized high intensity heat sources.1–7 These materials utilize alternating submicron layers of reacting elements to generate heat. The amount of energy released and the rate of reaction are dictated by the structure and chemistry of the multilayer.8 This allows for a great degree of control of the RMF reactivity and overall behavior making these materials ideal for a number of applications, such a joining, igniters and power sources.. (Throughout this work, the word “substrate” refers to the bulk Sn-Bi alloy to which the multilayer is bonded through reaction This is not the same substrate material used for sputter deposition of reactive multilayers.)
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